轻度认知障碍和阿尔茨海默病的边缘系统氢质子磁共振波谱特点

目的探讨海马和扣带回后部氢质子磁共振波谱(’H-MRS)改变在轻度认知障碍(MCI)和阿尔茨海默病(AD)早期诊断中的作用。方法应用’H-MRS技术检测15名健康老年人、15例MCI患者及15例AD患者脑内边缘系统的代谢物水平,对检测的N-乙酰天门冬氨酸(NAA)、胆碱复合物(Cho)、肌酸复合物(Cr)和肌醇(mI)波谱数据进行比较分析。结果 AD组与健康对照组和MCI组相比,海马部位的mI/Cr均升高(均P0.05),NAA/mI降低(均P0.05);随病情进展,扣带回后部的mI/Cr呈递增趋势(P0.05),NAA/mI呈递减趋势(P0.05);AD组和MCI组扣带回后部的NAA/mI与健康对照组的差别程度大于海马部位(P=0.001,P=0.019)。结论扣带回后部的mI/Cr和NAA/mI有助于鉴别健康老人和AD患者;海马部位的NAA/mI有助于鉴别痴呆和非痴呆;MRS在诊断AD和MCI方面有一定辅助作用。     

精神分裂症偏执型和双相Ⅰ型患者海马氢质子波谱研究

目的 比较精神分裂症偏执型和双相障碍I型躁狂发作患者海马代谢特点的异同.方法 对符合美国精神障碍诊断与统计手册第4版(DSM-IV)诊断标准的25例精神分裂症偏执型患者、20例双相I型躁狂发作患者和32名正常对照进行氢质子波谱扫描,检测双侧海马的N-乙酰天门冬氨酸(NAA)、胆碱(Cho)、肌醇(mI)及肌酸(Cr)4种代谢产物,以Cr为参照物,分别计算双侧NAA/Cr、Cho/Cr及ml/Cr.统计方法采用多组间单因素方差分析及偏相关分析.结果 精神分裂症组右侧海马Cho/Cr比正常对照组升高,差异有统计学意义(P＜0.05),而两患者组的差异无统计学意义(P＞0.05).双相I型躁狂组左侧海马mI/Cr较精神分裂症组和正常对照组均升高,差异有统计学意义(P＜0.05).双相I型躁狂组左右海马NAA/Cr的单侧化指数与1.0相比差异无统计学意义(P＞0.05).偏相关分析显示两患者组的右侧海马NAA/Cr均与病程呈正相关(P＜0.05).结论 精神分裂症偏执型患者可能存在右侧海马神经细胞膜损害;双相I型躁狂发作患者可能存在左侧海马神经细胞磷脂酰肌醇信号传导损害.     

氟西汀干预对大鼠抑郁模型海马代谢的影响

目的探讨氟西汀干预对大鼠抑郁模型的海马代谢的影响。方法 45只SD大鼠随机分为正常对照组(n=15)以及抑郁组(n=30)。抑郁组又被分为干预亚组(n=15)及未干预亚组(n=15)。采用慢性不可预知应激及孤养的方法建立抑郁模型。在制模成功后不干预亚组大鼠腹腔注射生理盐水2.0 ml/d,干预亚组大鼠腹腔注射盐酸氟西汀溶液5.0 mg/(kg·d);均持续4周。于干预前后对各组大鼠进行氢质子磁共振波谱分析检查,并进行比较。结果抑郁组大鼠双侧海马N-乙酰天冬氨酸(NAA)/肌酸(Cr)及谷氨酸复合物(Glx)/Cr显著低于正常对照组,胆碱复合物(Cho)/Cr及肌醇(mI)/Cr显著高于正常对照组(P0.05~0.01)。干预亚组双侧海马的NAA/Cr及Glx/Cr显著高于未干预亚组双侧海马的Cho,ho/Cr及右侧海马的mI/Cr显著低于未干预亚组(P0.05~0.01)。与干预前比较,干预亚组干预后双侧海马NAA/Cr及Glx/Cr显著升高(均P0.05);未干预亚组双侧海马Cho/Cr及mI/Cr显著升高,NAA/Cr及Glx/Cr显著降低(均P0.05)。结论氟西汀能够改善海马神经细胞的谷氨酸循环及肌醇磷酸循环,恢复神经元及神经胶质细胞的功能。     

氢质子磁共振波谱对Alzheimer病神经生化改变的分析

目的研究Alzheimer病(Alzheimerdisease,AD)的氢质子磁共振波谱分析改变,并与认知正常的老年志愿者(normalcognition,NC)进行比较。方法对AD组21例及NC组20名被观察者行磁共振波谱分析,测定双侧海马、颞顶叶联合区的N乙酰天门冬氨酸(N acetylaspartate,NAA)、胆碱(choline,Cho)和肌醇(myo inositol,mI)与肌酸(creatine,Cr)的比值。采用SPSS11.5软件进行统计分析。结果AD组和NC组双侧海马和颞顶联合区的NAA/Cr差异有显著性(P<0.05),双侧海马和左侧颞顶叶联合区的mI/Cr差异有显著性(P<0.05),双侧海马和颞顶叶联合区的Cho/Cr差异无显著性(P<0.05)。只有左侧海马的NAA/Cr水平下降与AD的严重程度呈正相关(r=0.470,P<0.05)。结论磁共振波谱分析可发现AD海马及颞顶联合区的NAA/Cr、mI/Cr改变,左侧海马NAA/Cr的减低可帮助评价AD的严重程度。     

老年期抑郁症患者海马磁共振质子波谱研究

目的:探讨老年期抑郁症患者海马的磁共振质子波谱(1H-MRS)特点。方法:应用1H-MRS成像技术检测11例晚发性抑郁症患者(患者组)予文拉法辛缓释剂治疗6周前后两侧海马头、体、尾部N-乙酰天门冬氨酸(NAA)、胆碱(Cho)和肌酸(Cr)3种代谢物,计算NAA/Cr和Cho/Cr比值。并且与15名健康对照者(对照组)的检测结果进行比较。结果:治疗前后患者组右侧海马头部NAA和Cho含量及左侧海马头部Cho含量均显著低于对照组(P<0.05或P<0.01)。患者组右侧海马头部Cho/Cr治疗前显著低于对照组(P<0.05),治疗后较治疗前显著升高(P<0.05),并且与对照组的差异无显著统计学意义(P>0.05)。患者组右侧海马体部Cho含量治疗前显著低于对照组(P<0.05),治疗后右侧海马体部NAA/Cr和Cho/Cr显著高于治疗前,与对照组的差异无显著统计学意义(P>0.05)。结论:老年期抑郁症患者可能存在左右两侧海马头部细胞膜代谢异常,右侧海马头部神经元活力下降。     

轻度认知障碍和轻度Alzeimer病的磁共振波谱分析

目的探讨氢质子磁共振波谱（1H—MRs）在轻度认知障碍（MCI）、轻度Alzheimer病（AD）诊断与鉴别诊断中的作用。方法对20例MCI患者、20例AD患者、20例正常对照者行。H—MRS检查,采用点分辨自旋回波波谱序列（PRESS）,测定双侧内侧颞叶的N-乙酰天门冬氨酸（NAA）、胆碱（Cho）和肌醇（mI）与肌酸（Cr）的比值,并比较各组闻NAA／Cr、mI／Cr、Cho／Cr比值的差别。结果轻度AD组及MCI组与正常对照组间双侧NAA／Cr有显著性差异（P〈0．05）,MCI组、轻度AD组、正常对照组三组间双侧mI／Cr有显著性差异（P〈0．05）,三组间Cho／Cr比值差异无统计学意义。结论1H—MRs能无创性提供MCI、AD患者脑部的代谢情况,NAA／Cr降低和mI／Cr升高有助于MCI、轻度AD的早期诊断。     

双相抑郁患者前额叶及海马磁共振质子波谱成像研究

目的探讨双相抑郁患者前额叶及海马磁共振质子波谱(proton magnetic resonance spectroscopy,1H-MRS)的代谢物变化特点,为其神经生物学研究提供线索。方法应用磁共振质子波谱成像技术检测26例双相抑郁患者(患者组)和26例单相抑郁患者及13例健康志愿者(对照组)双侧前额叶白质、前扣带回皮质、海马N-乙酰天门冬氨酸(N-Acetylaspartate,NAA)、胆碱(choline,Cho)、肌酸(creatine,Cr)3种代谢物,以Cr为参照物,分别计算双侧NAA/Cr和Cho/Cr比值。采用SPSS 13.0进行统计处理。结果患者组左侧前额叶白质NAA/Cr(1.65±0.31)低于对照组(2.37±0.36),左侧前额叶白质Cho/Cr(1.35±0.27)低于对照组(1.65±0.21),差异有统计学意义(P<0.05);右侧前额叶白质NAA/Cr、Cho/Cr值与正常对照组差异无统计学意义;患者组双侧前扣带回NAA/Cr、Cho/Cr值与正常对照组差异无统计学意义;患者组双侧海马NAA/Cr、Cho/Cr值与正常对照组差异无统计学意义;患者组与单相抑郁组的双侧额叶白质、双侧前扣带回皮质、双侧海马NAA/Cr、Cho/Cr值差异均无统计学意义。结论双相抑郁患者可能存在左侧前额叶神经元功能下降和膜磷脂代谢异常,其代谢物特点存在偏侧化。     

慢性精神分裂症患者双侧海马质子磁共振波谱成像研究

目的 利用质子磁共振波谱(~1H-MRS)研究慢性精神分裂症患者双侧海马生化物质的变化.方法 选择武警广东总队医院神经外科自2007年1月至2009年6月收治的慢性精神分裂症患者25例做为患者组,门诊体检正常志愿者25例为对照组,利用~1H-MRS测量2组成员双侧海马N-乙酰天门冬氨酸(NAA),胆碱复合物(Cho)和肌酸--磷酸肌酸复合物(Cr)含量,计算NAA/Cr和Cho/Cr的比值.结果 慢性精神分裂症患者双侧海马NAA/Cr的比值(左侧2.05±0.14,右侧1.98±0.17)低于正常对照组(左侧2.19±0.13,右侧2.17±0.14),差异有统计学意义(P<0.05);Cho/Cr比值(左侧1.30±0.12,右侧1.25±0.18)高于正常对照组(左侧1.04±0.15,右侧0.95±0.13),差异有统计学意义(P<0.05).结论 慢性精神分裂症患者双侧海马可能存在神经元的缺失或功能损伤,并且伴有膜磷脂代谢紊乱.     

路易体痴呆及阿尔茨海默病患者海马氢质子磁共振波谱研究

目的研究路易体痴呆(dementia with Lewy bodies,DLB)及阿尔茨海默病(Alzheimer’s disease,AD)患者双侧海马氢质子磁共振波谱(hydrogen proton magnetic resonance spectroscopy,1H-MRS)代谢物水平变化特点,探索海马1H-MRS在区分DLB和AD中的意义。方法在3T场强条件下,对14例DLB、14例AD患者及15例正常对照(normal control,NC)双侧海马进行单体素1H-MRS采集,测定海马N-乙酰天门冬氨酸(N-acetylaspartate,NAA)、胆碱(choline,Cho)及肌醇(myo-inositol,mI)与肌酸(creatine,Cr)的比值。结果三组海马1H-MRS测量值比较,左、右侧海马NAA/Cr值差异均有统计学意义(F=5.347,P=0.009;F=5.302,P=0.009)。DLB组左侧海马NAA/Cr值(1.56±0.30)、AD组左侧海马NAA/Cr值(1.51±0.22)均低于NC组(1.84±0.35)(均P<0.05)。DLB组右侧海马NAA/Cr值(1.62±0.27)、AD组右侧海马NAA/Cr值(1.49±0.39)均低于NC组(1.90±0.37)(均P<0.05)。DLB组双侧海马NAA/Cr值略高于AD组,但差异无统计学意义(均P>0.05)。三组间双侧海马mI/Cr值、Cho/Cr值差异无统计学意义(均P>0.05)。结论 DLB、AD患者双侧海马存在神经元功能障碍,其代谢物水平不能有效区分DLB和AD。     

难治性抑郁症患者海马代谢的磁共振质子波谱研究

目的 探讨难治性抑郁症患者双侧海马磁共振质子波谱(1H-MRS)的代谢特点.方法 运用1H-MRS成像系统检测16例难治性抑郁症患者(患者组)和16名健康对照者(对照组)双侧海马的N-乙酰天门冬氨酸(NAA)、胆碱复合物(Cho)、肌醇(mI)及肌酸(Cr)4种代谢产物,分别计算双侧NAA/Cr、Cho/Cr及mI/Cr.采用配对t检验、独立样本t检验及偏相关分析进行统计处理.结果 对照组左侧海马NAA/Cr(1.43±0.19),明显高于右侧(1.21±0.10),P＜0.01.患者组双侧海马NAA/Cr的差异无统计学意义(P＞0.05),右侧海马NAA/Cr(1.44±0.31),明显高于对照组(1.21±0.10),P＜0.01.未发现患者组海马的任何代谢指标与病程及汉密尔顿抑郁量表(17项)评分的相关性(P＞0.05).结论 难治性抑郁症患者右侧海马代谢增强,双侧海马NAA/Cr不对称性消失.     

The correlation between 1H-MR spectroscopy and clinical manifestation with tuberous sclerosis complex

Tuberous sclerosis complex (TSC) is an autosomal dominant neurocutaneous disease. Cortical tubers are one of the standard intracranial hallmarks of TSC, they comprise subependymal hamartomas protruding into the ventricles, cortical and white matter hamartomas, and giant cell tumors. The clinical course of TSC varies from asymptomatic to severe, with epileptic seizures and psychomotor retardation. We discuss here the correlation between clinical manifestation and features on 1H-MR spectroscopy ( 1H-MRS) of the white matter involving cortical tubers in patients with TSC. Statistical analysis of the N-acetylaspartate (NAA), choline (Cho) and myoinositol (mI)/creatinine (Cr) ratios between tubers and normal controls showed decreased NAA/Cr and increased mI/Cr ratios (P<0.05) in tubers, but no significance difference in Cho/Cr. The significance of the clinical appearance is associated with a decreased ratio of NAA/Cr in tubers with TSC. An elevated ratio of mI/Cr in tuber does not parallel the severity of the clinical features of TSC. These findings suggest that 1H-MRS may be useful for the evaluation of the clinical severity and prognostic diagnosis of TSC.     

急性脑梗死后血管性认知障碍的磁共振波谱研究

目的应用质子磁共振波谱(1 H-MRS)技术,探讨急性脑梗死后血管性认知障碍(VCI)患者的颅内物质代谢变化与认知损害的关系。方法对86例脑梗死患者(脑梗死组)及21名健康对照者(对照组)进行简易精神状态检查量表(MMSE)和蒙特利尔认知评分量表(MoCA)评分,并计算其视空间及执行功能评分。根据认知评分结果,将脑梗死组分为脑梗死后认知功能正常组(NCI)、脑梗死后VCI非痴呆组(VCIND)、脑梗死后痴呆组。对脑梗死组及健康对照进行1 H-MRS检查,测定右额叶、左颞叶、左丘脑及顶枕叶交界处N-乙酰天冬氨酸(NAA)/肌酸(Cr)、肌醇(mI)/Cr及胆碱复合物(Cho)/Cr比值,并分析脑梗死组物质代谢比值与认知评分(MoCA评分、视空间及执行功能)间的相关性。结果 (1)与对照组(左颞叶及左丘脑NAA/Cr 1.53±0.08、1.52±0.10)相比,VCIND组左颞叶及左丘脑NAA/Cr(1.46±0.07、1.47±0.07)降低(P=0.001、P=0.006);与VCIND组右额叶1.46±0.10比较,梗死后痴呆组右额叶、左颞叶及左丘脑NAA/Cr(1.38±0.14、1.39±0.06、1.42±0.09)降低(分别P<0.001、P<0.001、P=0.003)。对照组及NCI组间的各区域物质代谢比值无统计学差异(均P>0.05)。(2)所有脑梗死患者中,除右额叶Cho/Cr外,余各感兴趣区物质代谢比值与MoCA评分间均相关,其中以左颞叶、左丘脑NAA/Cr值与MoCA评分的相关性为著(分别r=0.566,P<0.001;r=0.485,P<0.001);除右额叶、丘脑及顶枕叶交界处Cho/Cr外,余各物质代谢比值与视空间及执行功能评分间相关,其中亦以左颞叶及左丘脑NAA/Cr值的相关性为著(分别NAA/Cr为r=0.591,P<0.001;r=0.491,P<0.001)。结论左丘脑及左颞叶代谢异常可能为VCI患者认知损害的早期关键环节之一,随着VCI病变进展可能整个皮质及皮质下环路区域都将出现代谢异常。     

Longitudinal metabolic and cognitive changes in mild cognitive impairment patients

Advancements in clinical therapies have identified the need for biomarkers of early Alzheimer disease that distinguish the earliest stages of pathology and target those patients who are likely to gain the most benefit. The aim of this study was to characterize the longitudinal metabolic changes measured by 1H magnetic resonance spectroscopy in correlation to neuropsychologic indices of episodic memory, attention and mental processing speed, language facility, and executive function in subjects with mild cognitive impairment (MCI). Quantitative 1H magnetic resonance spectroscopy of the posterior cingulate gyrus was performed and repeated at 11.56+/-4.3 months. N-acetyl aspartate (NAA), total choline (Cho), total creatine (Cr), myo-inositol (mI), and glutamate/glutamine (Glx) metabolite levels were measured, corrected for cerebrospinal fluid dilution, and ratios calculated in MCI and cognitively normal subjects. In the first study, MCI subjects showed lower NAA levels, NAA/Cho, and NAA/mI ratios and increased Cho/Cr and mI/Cr compared with controls. In the follow-up study, 36% of the MCI subjects [atypical MCI (atMCI)] showed interval increases in NAA, Cr, and Glx levels compared with 64% of MCI subjects (typical MCI) who showed an interval decrease in NAA, Cr, and Glx. Both MCI subgroups had higher Clinical Dementia Rating scores and lower scores on episodic memory, phonemic, and semantic word fluency tasks, compared with controls. The annualized rate of change in metabolic and cognitive status did not differ between normal aging and MCI subjects. atMCI subjects showed significant negative correlations between metabolite levels and executive function task scores, with NAA/mI showing a significant positive correlation with phonemic and semantic word fluency. There were no significant correlations between metabolite levels and cognitive performance in tMCI subjects; however, NAA/mI and mI/Cr were negatively correlated with executive function tasks. These results indicate 2 distinct evolving metabolite profiles that correlate with changes in executive function and can be used to differentiate MCI from normal aging.     

急性脑梗死患者脑组织磁共振波谱研究

目的研究基底节区急性脑梗死患者脑组织磁共振波谱(MRS)的改变。方法应用MRS检测50例一侧基底节区梗死患者(脑梗死组)及50例其他疾病患者(对照组)双侧基底节区的N-乙酰天冬氨酸(NAA)、胆碱复合物(Cho)、肌酸复合物(Cr)和乳酸(Lac)水平及NAA/Cr、Cho/Cr比值。结果脑梗死组病灶侧Cho及Cr水平均显著低于非病灶侧(均P<0.05),NAA、Lac水平及NAA/Cr、Cho/Cr比值的差异无统计学意义。脑梗死组病灶侧及非病灶侧Cho、NAA及Cr水平均明显低于对照组病灶对应区(P<0.001～0.05),而Lac水平明显高于对照组病灶对应区(均P<0.05)。与对照组病灶对应区比较,脑梗死组病灶侧Cho/Cr比值显著升高,非病灶侧NAA/Cr比值显著降低(均P<0.05)。结论基底节区梗死急性期病灶侧及对侧脑组织均有明显的代谢障碍,且病灶区代谢异常较对侧更明显。     

Metabolic changes in 37 newly diagnosed Wilson's disease patients assessed by magnetic resonance spectroscopy

Wilson's Disease (WD) is a rare autosomal recessive disorder. The literature about proton MR spectroscopy (MRS) in WD is based mostly on data derived from patients undergoing treatment. The aim of this study was to identify brain metabolic changes in newly diagnosed WD patients using MRS to elucidate the pathomechanism of the cerebral pathology of WD. The globus pallidus and thalamus of 37 patients with WD were examined bilaterally with MRS. The calculations were performed for: myoinositol (mI), choline (Cho), creatine (Cr), N-acetyl-aspartate (NAA), lipid (Lip), glutamine, and glutamate (Glx). In all WD patients a significantly decreased mI/Cr and NAA/Cr ratio levels and an increased Lip/Cr ratio in the pallidum were observed. Analysis revealed a significantly increased Glx/Cr and Lip/Cr ratio in the thalamus. In the pallidum of neurologically impaired patients, Cho/Cr, Glx/Cr and Lip/Cr ratios were higher than in control subjects, and the NAA/Cr was significantly lower. In hepatic patients, the mI/Cr, Cho/Cr and NAA/Cr ratio levels were lower than in controls. The Cho/Cr and Lip/Cr ratios were higher in the thalami of neurologically impaired patients, and Lip/Cr ratios were higher than controls' in hepatic patients. Both findings were statistically significant. Compared to the thalamus, the basal ganglia are more sensitive to ongoing degenerative changes and portal-systemic encephalopathy in WD. The NAA/Cr reduction in hepatic and neurologically impaired patients could indicate that neurodegeneration is associated with all presentations of WD. In hepatic patients a mI and Cho decrease and in neurological Glx increase can be caused by porto-systemic shunting.     

Proton magnetic resonance spectroscopy study of dyskinesia patients.

Oral dyskinesias may occur spontaneously or be induced by medications such as antipsychotics and antidepressants. In this study, single voxel proton magnetic resonance spectroscopy was used to compare metabolite levels in the striatum for (1) 12 patients with drug-induced tardive dyskinesia (TD), (2) 12 patients with spontaneous oral dyskinesia (SOD), (3) 8 antidepressant-treated patients without TD, and (4) 8 control subjects. Statistically significant reductions in the choline/creatine (Cho/Cr) ratio were measured for the drug-treated patients with TD (-13%, P = 0.020) and SOD patients (-12%, P = 0.034) relative to control subjects. In comparison with antidepressant-treated patients without TD, drug-treated patients with TD showed a non statistically significant reduction in Cho/Cr (-11%, P = 0.079). All other metabolite ratios (N-acetylaspartate (NAA)/Cr, myo-inositol (mI)/Cr, glutamine + glutamate (Glx)/Cr, macromolecule + lipid (MM+Lip)/Cr, NAA/Cho) were unaffected by either type of dyskinesia. The observed Cho/Cr reduction in dyskinesia patients suggests decreased membrane phosphatidylcholine turnover, which provides free choline as precursor of molecules responsible for cellular signal transduction.     

Cognitive impairment: classification by 1H magnetic resonance spectroscopy.

1H magnetic resonance spectroscopy (MRS) allows accurate and non-invasive in vivo metabolic study, and is a useful tool for the diagnosis of different forms of dementias. Cognitive impairment pathologies have been almost exclusively studied with MRS by comparison with healthy without a global comparison amongst Alzheimer disease (AD), vascular dementia, mild cognitive impairment (MCI) and major depression patients with cognitive impairment. Whereas decrease of N-acetylaspartate (NAA) and increase myo-Inositol (mI) at different brain locations by 1H MRS are common features of AD, Choline (Cho) alterations have been inconclusive. In our study, 64 patients with cognitive impairment were evaluated by 1H MRS using two echo times (31 and 136 ms). There were statistical differences between dementia (AD and vascular dementia) and non-dementia (MCI and depression) spectra at posterior cingulate gyrus. Cho/Cr, mI/Cr and NAA/Cr have been valuables for the differentiation amongst the different cognitive impairment entities. NAA/mI provides the best area under the ROC curve with the highest sensitivity (82.5%) and specificity (72.7%) in diagnosing AD. NAA/mI and mI/Cr ratios differed amongst the four cognitive impairment degenerative pathologies. Metabolic MRS differences found amongst patients with cognitive impairment entities can be useful to differentiate between AD, vascular dementia, MCI and depression.     

MRS联合Ki-67鉴别脑转移瘤与高级别胶质瘤的作用

目的 探讨磁共振波谱(MRS)参数联合Ki-67指数在鉴别脑转移瘤(BM)与原发性高级别胶质瘤(HGG)中的作用.方法 回顾性分析2018年1月至2020年8月手术及病理证实的30例原发性HGG(HGG组)和13例BM(BM组)的临床资料.所有病人术前均行MRS检查,术后均行Ki-67检测.MRS参数包括N-乙酰天冬氨...     

MRI和磁共振波谱在肝性脑病的应用价值

目的探讨MRI和磁共振波谱(1H-MRS)在肝性脑病中的应用价值。方法对6例肝性脑病患者行MRI和1H-MRS检查,检测基底节MRS的N-乙酰天门冬氨酸(NAA)、肌酸(Cr)、胆碱(Cho)、谷氨酰胺复合物(Glx)、肌醇(mI)的峰值,计算Cho、mI、NAA与Cr的比值,并与5名正常对照者比较。结果 MRI检查显示,6例肝性脑病患者双侧基底节T1WI均出现高信号,其中1例累及内囊、2例累及尾状核、1例累及中脑被盖;5例患者T2WI未见明显异常信号,1例患者因并发弥漫性脑水肿T2WI出现广泛高信号影。1H-MRS显示,肝性脑病组双侧基底节Cho峰、mI峰、Cho/Cr和mI/Cr显著低于正常对照组,Glx峰显著高于正常对照组(P<0.01～0.005);两组NAA/Cr比较差异无统计学意义。结论 MRI显示双侧基底节T1WI高信号是肝性脑病特征性改变。1H-MRS能准确地反映其脑代谢物质水平的变化。